1 /* 2 * Copyright (c) 2009 The DragonFly Project. All rights reserved. 3 * 4 * This code is derived from software contributed to The DragonFly Project 5 * by Alex Hornung <ahornung@gmail.com> 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 11 * 1. Redistributions of source code must retain the above copyright 12 * notice, this list of conditions and the following disclaimer. 13 * 2. Redistributions in binary form must reproduce the above copyright 14 * notice, this list of conditions and the following disclaimer in 15 * the documentation and/or other materials provided with the 16 * distribution. 17 * 3. Neither the name of The DragonFly Project nor the names of its 18 * contributors may be used to endorse or promote products derived 19 * from this software without specific, prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING, 27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 #include <sys/param.h> 35 #include <sys/systm.h> 36 #include <sys/time.h> 37 #include <sys/kernel.h> 38 #include <sys/lock.h> 39 #include <sys/fcntl.h> 40 #include <sys/proc.h> 41 #include <sys/priv.h> 42 #include <sys/signalvar.h> 43 #include <sys/vnode.h> 44 #include <sys/uio.h> 45 #include <sys/mount.h> 46 #include <sys/file.h> 47 #include <sys/fcntl.h> 48 #include <sys/namei.h> 49 #include <sys/dirent.h> 50 #include <sys/malloc.h> 51 #include <sys/stat.h> 52 #include <sys/reg.h> 53 #include <vm/vm_pager.h> 54 #include <vm/vm_zone.h> 55 #include <vm/vm_object.h> 56 #include <sys/filio.h> 57 #include <sys/ttycom.h> 58 #include <sys/tty.h> 59 #include <sys/diskslice.h> 60 #include <sys/sysctl.h> 61 #include <sys/devfs.h> 62 #include <sys/pioctl.h> 63 #include <vfs/fifofs/fifo.h> 64 65 #include <machine/limits.h> 66 67 #include <sys/buf2.h> 68 #include <sys/sysref2.h> 69 #include <sys/mplock2.h> 70 #include <vm/vm_page2.h> 71 72 MALLOC_DECLARE(M_DEVFS); 73 #define DEVFS_BADOP (void *)devfs_badop 74 75 static int devfs_badop(struct vop_generic_args *); 76 static int devfs_access(struct vop_access_args *); 77 static int devfs_inactive(struct vop_inactive_args *); 78 static int devfs_reclaim(struct vop_reclaim_args *); 79 static int devfs_readdir(struct vop_readdir_args *); 80 static int devfs_getattr(struct vop_getattr_args *); 81 static int devfs_setattr(struct vop_setattr_args *); 82 static int devfs_readlink(struct vop_readlink_args *); 83 static int devfs_print(struct vop_print_args *); 84 85 static int devfs_nresolve(struct vop_nresolve_args *); 86 static int devfs_nlookupdotdot(struct vop_nlookupdotdot_args *); 87 static int devfs_nmkdir(struct vop_nmkdir_args *); 88 static int devfs_nsymlink(struct vop_nsymlink_args *); 89 static int devfs_nrmdir(struct vop_nrmdir_args *); 90 static int devfs_nremove(struct vop_nremove_args *); 91 92 static int devfs_spec_open(struct vop_open_args *); 93 static int devfs_spec_close(struct vop_close_args *); 94 static int devfs_spec_fsync(struct vop_fsync_args *); 95 96 static int devfs_spec_read(struct vop_read_args *); 97 static int devfs_spec_write(struct vop_write_args *); 98 static int devfs_spec_ioctl(struct vop_ioctl_args *); 99 static int devfs_spec_kqfilter(struct vop_kqfilter_args *); 100 static int devfs_spec_strategy(struct vop_strategy_args *); 101 static void devfs_spec_strategy_done(struct bio *); 102 static int devfs_spec_freeblks(struct vop_freeblks_args *); 103 static int devfs_spec_bmap(struct vop_bmap_args *); 104 static int devfs_spec_advlock(struct vop_advlock_args *); 105 static void devfs_spec_getpages_iodone(struct bio *); 106 static int devfs_spec_getpages(struct vop_getpages_args *); 107 108 109 static int devfs_specf_close(struct file *); 110 static int devfs_specf_read(struct file *, struct uio *, struct ucred *, int); 111 static int devfs_specf_write(struct file *, struct uio *, struct ucred *, int); 112 static int devfs_specf_stat(struct file *, struct stat *, struct ucred *); 113 static int devfs_specf_kqfilter(struct file *, struct knote *); 114 static int devfs_specf_ioctl(struct file *, u_long, caddr_t, 115 struct ucred *, struct sysmsg *); 116 static __inline int sequential_heuristic(struct uio *, struct file *); 117 118 extern struct lock devfs_lock; 119 120 static int mpsafe_reads, mpsafe_writes, mplock_reads, mplock_writes; 121 122 /* 123 * devfs vnode operations for regular files 124 */ 125 struct vop_ops devfs_vnode_norm_vops = { 126 .vop_default = vop_defaultop, 127 .vop_access = devfs_access, 128 .vop_advlock = DEVFS_BADOP, 129 .vop_bmap = DEVFS_BADOP, 130 .vop_close = vop_stdclose, 131 .vop_getattr = devfs_getattr, 132 .vop_inactive = devfs_inactive, 133 .vop_ncreate = DEVFS_BADOP, 134 .vop_nresolve = devfs_nresolve, 135 .vop_nlookupdotdot = devfs_nlookupdotdot, 136 .vop_nlink = DEVFS_BADOP, 137 .vop_nmkdir = devfs_nmkdir, 138 .vop_nmknod = DEVFS_BADOP, 139 .vop_nremove = devfs_nremove, 140 .vop_nrename = DEVFS_BADOP, 141 .vop_nrmdir = devfs_nrmdir, 142 .vop_nsymlink = devfs_nsymlink, 143 .vop_open = vop_stdopen, 144 .vop_pathconf = vop_stdpathconf, 145 .vop_print = devfs_print, 146 .vop_read = DEVFS_BADOP, 147 .vop_readdir = devfs_readdir, 148 .vop_readlink = devfs_readlink, 149 .vop_reclaim = devfs_reclaim, 150 .vop_setattr = devfs_setattr, 151 .vop_write = DEVFS_BADOP, 152 .vop_ioctl = DEVFS_BADOP 153 }; 154 155 /* 156 * devfs vnode operations for character devices 157 */ 158 struct vop_ops devfs_vnode_dev_vops = { 159 .vop_default = vop_defaultop, 160 .vop_access = devfs_access, 161 .vop_advlock = devfs_spec_advlock, 162 .vop_bmap = devfs_spec_bmap, 163 .vop_close = devfs_spec_close, 164 .vop_freeblks = devfs_spec_freeblks, 165 .vop_fsync = devfs_spec_fsync, 166 .vop_getattr = devfs_getattr, 167 .vop_getpages = devfs_spec_getpages, 168 .vop_inactive = devfs_inactive, 169 .vop_open = devfs_spec_open, 170 .vop_pathconf = vop_stdpathconf, 171 .vop_print = devfs_print, 172 .vop_kqfilter = devfs_spec_kqfilter, 173 .vop_read = devfs_spec_read, 174 .vop_readdir = DEVFS_BADOP, 175 .vop_readlink = DEVFS_BADOP, 176 .vop_reclaim = devfs_reclaim, 177 .vop_setattr = devfs_setattr, 178 .vop_strategy = devfs_spec_strategy, 179 .vop_write = devfs_spec_write, 180 .vop_ioctl = devfs_spec_ioctl 181 }; 182 183 struct vop_ops *devfs_vnode_dev_vops_p = &devfs_vnode_dev_vops; 184 185 struct fileops devfs_dev_fileops = { 186 .fo_read = devfs_specf_read, 187 .fo_write = devfs_specf_write, 188 .fo_ioctl = devfs_specf_ioctl, 189 .fo_kqfilter = devfs_specf_kqfilter, 190 .fo_stat = devfs_specf_stat, 191 .fo_close = devfs_specf_close, 192 .fo_shutdown = nofo_shutdown 193 }; 194 195 /* 196 * These two functions are possibly temporary hacks for 197 * devices (aka the pty code) which want to control the 198 * node attributes themselves. 199 * 200 * XXX we may ultimately desire to simply remove the uid/gid/mode 201 * from the node entirely. 202 */ 203 static __inline void 204 node_sync_dev_get(struct devfs_node *node) 205 { 206 cdev_t dev; 207 208 if ((dev = node->d_dev) && (dev->si_flags & SI_OVERRIDE)) { 209 node->uid = dev->si_uid; 210 node->gid = dev->si_gid; 211 node->mode = dev->si_perms; 212 } 213 } 214 215 static __inline void 216 node_sync_dev_set(struct devfs_node *node) 217 { 218 cdev_t dev; 219 220 if ((dev = node->d_dev) && (dev->si_flags & SI_OVERRIDE)) { 221 dev->si_uid = node->uid; 222 dev->si_gid = node->gid; 223 dev->si_perms = node->mode; 224 } 225 } 226 227 /* 228 * generic entry point for unsupported operations 229 */ 230 static int 231 devfs_badop(struct vop_generic_args *ap) 232 { 233 return (EIO); 234 } 235 236 237 static int 238 devfs_access(struct vop_access_args *ap) 239 { 240 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 241 int error; 242 243 if (!devfs_node_is_accessible(node)) 244 return ENOENT; 245 node_sync_dev_get(node); 246 error = vop_helper_access(ap, node->uid, node->gid, 247 node->mode, node->flags); 248 249 return error; 250 } 251 252 253 static int 254 devfs_inactive(struct vop_inactive_args *ap) 255 { 256 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 257 258 if (node == NULL || (node->flags & DEVFS_NODE_LINKED) == 0) 259 vrecycle(ap->a_vp); 260 return 0; 261 } 262 263 264 static int 265 devfs_reclaim(struct vop_reclaim_args *ap) 266 { 267 struct devfs_node *node; 268 struct vnode *vp; 269 int locked; 270 271 /* 272 * Check if it is locked already. if not, we acquire the devfs lock 273 */ 274 if (!(lockstatus(&devfs_lock, curthread)) == LK_EXCLUSIVE) { 275 lockmgr(&devfs_lock, LK_EXCLUSIVE); 276 locked = 1; 277 } else { 278 locked = 0; 279 } 280 281 /* 282 * Get rid of the devfs_node if it is no longer linked into the 283 * topology. 284 */ 285 vp = ap->a_vp; 286 if ((node = DEVFS_NODE(vp)) != NULL) { 287 node->v_node = NULL; 288 if ((node->flags & DEVFS_NODE_LINKED) == 0) 289 devfs_freep(node); 290 } 291 292 if (locked) 293 lockmgr(&devfs_lock, LK_RELEASE); 294 295 /* 296 * v_rdev needs to be properly released using v_release_rdev 297 * Make sure v_data is NULL as well. 298 */ 299 vp->v_data = NULL; 300 v_release_rdev(vp); 301 return 0; 302 } 303 304 305 static int 306 devfs_readdir(struct vop_readdir_args *ap) 307 { 308 struct devfs_node *dnode = DEVFS_NODE(ap->a_vp); 309 struct devfs_node *node; 310 int cookie_index; 311 int ncookies; 312 int error2; 313 int error; 314 int r; 315 off_t *cookies; 316 off_t saveoff; 317 318 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_readdir() called!\n"); 319 320 if (ap->a_uio->uio_offset < 0 || ap->a_uio->uio_offset > INT_MAX) 321 return (EINVAL); 322 if ((error = vn_lock(ap->a_vp, LK_EXCLUSIVE | LK_RETRY)) != 0) 323 return (error); 324 325 if (!devfs_node_is_accessible(dnode)) { 326 vn_unlock(ap->a_vp); 327 return ENOENT; 328 } 329 330 lockmgr(&devfs_lock, LK_EXCLUSIVE); 331 332 saveoff = ap->a_uio->uio_offset; 333 334 if (ap->a_ncookies) { 335 ncookies = ap->a_uio->uio_resid / 16 + 1; /* Why / 16 ?? */ 336 if (ncookies > 256) 337 ncookies = 256; 338 cookies = kmalloc(256 * sizeof(off_t), M_TEMP, M_WAITOK); 339 cookie_index = 0; 340 } else { 341 ncookies = -1; 342 cookies = NULL; 343 cookie_index = 0; 344 } 345 346 nanotime(&dnode->atime); 347 348 if (saveoff == 0) { 349 r = vop_write_dirent(&error, ap->a_uio, dnode->d_dir.d_ino, 350 DT_DIR, 1, "."); 351 if (r) 352 goto done; 353 if (cookies) 354 cookies[cookie_index] = saveoff; 355 saveoff++; 356 cookie_index++; 357 if (cookie_index == ncookies) 358 goto done; 359 } 360 361 if (saveoff == 1) { 362 if (dnode->parent) { 363 r = vop_write_dirent(&error, ap->a_uio, 364 dnode->parent->d_dir.d_ino, 365 DT_DIR, 2, ".."); 366 } else { 367 r = vop_write_dirent(&error, ap->a_uio, 368 dnode->d_dir.d_ino, 369 DT_DIR, 2, ".."); 370 } 371 if (r) 372 goto done; 373 if (cookies) 374 cookies[cookie_index] = saveoff; 375 saveoff++; 376 cookie_index++; 377 if (cookie_index == ncookies) 378 goto done; 379 } 380 381 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 382 if ((node->flags & DEVFS_HIDDEN) || 383 (node->flags & DEVFS_INVISIBLE)) { 384 continue; 385 } 386 387 /* 388 * If the node type is a valid devfs alias, then we make sure that the 389 * target isn't hidden. If it is, we don't show the link in the 390 * directory listing. 391 */ 392 if ((node->node_type == Plink) && (node->link_target != NULL) && 393 (node->link_target->flags & DEVFS_HIDDEN)) 394 continue; 395 396 if (node->cookie < saveoff) 397 continue; 398 399 saveoff = node->cookie; 400 401 error2 = vop_write_dirent(&error, ap->a_uio, node->d_dir.d_ino, 402 node->d_dir.d_type, 403 node->d_dir.d_namlen, 404 node->d_dir.d_name); 405 406 if (error2) 407 break; 408 409 saveoff++; 410 411 if (cookies) 412 cookies[cookie_index] = node->cookie; 413 ++cookie_index; 414 if (cookie_index == ncookies) 415 break; 416 } 417 418 done: 419 lockmgr(&devfs_lock, LK_RELEASE); 420 vn_unlock(ap->a_vp); 421 422 ap->a_uio->uio_offset = saveoff; 423 if (error && cookie_index == 0) { 424 if (cookies) { 425 kfree(cookies, M_TEMP); 426 *ap->a_ncookies = 0; 427 *ap->a_cookies = NULL; 428 } 429 } else { 430 if (cookies) { 431 *ap->a_ncookies = cookie_index; 432 *ap->a_cookies = cookies; 433 } 434 } 435 return (error); 436 } 437 438 439 static int 440 devfs_nresolve(struct vop_nresolve_args *ap) 441 { 442 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 443 struct devfs_node *node, *found = NULL; 444 struct namecache *ncp; 445 struct vnode *vp = NULL; 446 int error = 0; 447 int len; 448 int depth; 449 450 ncp = ap->a_nch->ncp; 451 len = ncp->nc_nlen; 452 453 if (!devfs_node_is_accessible(dnode)) 454 return ENOENT; 455 456 lockmgr(&devfs_lock, LK_EXCLUSIVE); 457 458 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir)) { 459 error = ENOENT; 460 cache_setvp(ap->a_nch, NULL); 461 goto out; 462 } 463 464 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 465 if (len == node->d_dir.d_namlen) { 466 if (!memcmp(ncp->nc_name, node->d_dir.d_name, len)) { 467 found = node; 468 break; 469 } 470 } 471 } 472 473 if (found) { 474 depth = 0; 475 while ((found->node_type == Plink) && (found->link_target)) { 476 if (depth >= 8) { 477 devfs_debug(DEVFS_DEBUG_SHOW, "Recursive link or depth >= 8"); 478 break; 479 } 480 481 found = found->link_target; 482 ++depth; 483 } 484 485 if (!(found->flags & DEVFS_HIDDEN)) 486 devfs_allocv(/*ap->a_dvp->v_mount, */ &vp, found); 487 } 488 489 if (vp == NULL) { 490 error = ENOENT; 491 cache_setvp(ap->a_nch, NULL); 492 goto out; 493 494 } 495 KKASSERT(vp); 496 vn_unlock(vp); 497 cache_setvp(ap->a_nch, vp); 498 vrele(vp); 499 out: 500 lockmgr(&devfs_lock, LK_RELEASE); 501 502 return error; 503 } 504 505 506 static int 507 devfs_nlookupdotdot(struct vop_nlookupdotdot_args *ap) 508 { 509 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 510 511 *ap->a_vpp = NULL; 512 if (!devfs_node_is_accessible(dnode)) 513 return ENOENT; 514 515 lockmgr(&devfs_lock, LK_EXCLUSIVE); 516 if (dnode->parent != NULL) { 517 devfs_allocv(ap->a_vpp, dnode->parent); 518 vn_unlock(*ap->a_vpp); 519 } 520 lockmgr(&devfs_lock, LK_RELEASE); 521 522 return ((*ap->a_vpp == NULL) ? ENOENT : 0); 523 } 524 525 526 static int 527 devfs_getattr(struct vop_getattr_args *ap) 528 { 529 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 530 struct vattr *vap = ap->a_vap; 531 struct partinfo pinfo; 532 int error = 0; 533 534 #if 0 535 if (!devfs_node_is_accessible(node)) 536 return ENOENT; 537 #endif 538 node_sync_dev_get(node); 539 540 lockmgr(&devfs_lock, LK_EXCLUSIVE); 541 542 /* start by zeroing out the attributes */ 543 VATTR_NULL(vap); 544 545 /* next do all the common fields */ 546 vap->va_type = ap->a_vp->v_type; 547 vap->va_mode = node->mode; 548 vap->va_fileid = DEVFS_NODE(ap->a_vp)->d_dir.d_ino ; 549 vap->va_flags = 0; 550 vap->va_blocksize = DEV_BSIZE; 551 vap->va_bytes = vap->va_size = 0; 552 553 vap->va_fsid = ap->a_vp->v_mount->mnt_stat.f_fsid.val[0]; 554 555 vap->va_atime = node->atime; 556 vap->va_mtime = node->mtime; 557 vap->va_ctime = node->ctime; 558 559 vap->va_nlink = 1; /* number of references to file */ 560 561 vap->va_uid = node->uid; 562 vap->va_gid = node->gid; 563 564 vap->va_rmajor = 0; 565 vap->va_rminor = 0; 566 567 if ((node->node_type == Pdev) && node->d_dev) { 568 reference_dev(node->d_dev); 569 vap->va_rminor = node->d_dev->si_uminor; 570 release_dev(node->d_dev); 571 } 572 573 /* For a softlink the va_size is the length of the softlink */ 574 if (node->symlink_name != 0) { 575 vap->va_bytes = vap->va_size = node->symlink_namelen; 576 } 577 578 /* 579 * For a disk-type device, va_size is the size of the underlying 580 * device, so that lseek() works properly. 581 */ 582 if ((node->d_dev) && (dev_dflags(node->d_dev) & D_DISK)) { 583 bzero(&pinfo, sizeof(pinfo)); 584 error = dev_dioctl(node->d_dev, DIOCGPART, (void *)&pinfo, 585 0, proc0.p_ucred, NULL); 586 if ((error == 0) && (pinfo.media_blksize != 0)) { 587 vap->va_size = pinfo.media_size; 588 } else { 589 vap->va_size = 0; 590 error = 0; 591 } 592 } 593 594 lockmgr(&devfs_lock, LK_RELEASE); 595 596 return (error); 597 } 598 599 600 static int 601 devfs_setattr(struct vop_setattr_args *ap) 602 { 603 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 604 struct vattr *vap; 605 int error = 0; 606 607 if (!devfs_node_is_accessible(node)) 608 return ENOENT; 609 node_sync_dev_get(node); 610 611 lockmgr(&devfs_lock, LK_EXCLUSIVE); 612 613 vap = ap->a_vap; 614 615 if (vap->va_uid != (uid_t)VNOVAL) { 616 if ((ap->a_cred->cr_uid != node->uid) && 617 (!groupmember(node->gid, ap->a_cred))) { 618 error = priv_check(curthread, PRIV_VFS_CHOWN); 619 if (error) 620 goto out; 621 } 622 node->uid = vap->va_uid; 623 } 624 625 if (vap->va_gid != (uid_t)VNOVAL) { 626 if ((ap->a_cred->cr_uid != node->uid) && 627 (!groupmember(node->gid, ap->a_cred))) { 628 error = priv_check(curthread, PRIV_VFS_CHOWN); 629 if (error) 630 goto out; 631 } 632 node->gid = vap->va_gid; 633 } 634 635 if (vap->va_mode != (mode_t)VNOVAL) { 636 if (ap->a_cred->cr_uid != node->uid) { 637 error = priv_check(curthread, PRIV_VFS_ADMIN); 638 if (error) 639 goto out; 640 } 641 node->mode = vap->va_mode; 642 } 643 644 out: 645 node_sync_dev_set(node); 646 nanotime(&node->ctime); 647 lockmgr(&devfs_lock, LK_RELEASE); 648 649 return error; 650 } 651 652 653 static int 654 devfs_readlink(struct vop_readlink_args *ap) 655 { 656 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 657 int ret; 658 659 if (!devfs_node_is_accessible(node)) 660 return ENOENT; 661 662 lockmgr(&devfs_lock, LK_EXCLUSIVE); 663 ret = uiomove(node->symlink_name, node->symlink_namelen, ap->a_uio); 664 lockmgr(&devfs_lock, LK_RELEASE); 665 666 return ret; 667 } 668 669 670 static int 671 devfs_print(struct vop_print_args *ap) 672 { 673 return (0); 674 } 675 676 static int 677 devfs_nmkdir(struct vop_nmkdir_args *ap) 678 { 679 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 680 struct devfs_node *node; 681 682 if (!devfs_node_is_accessible(dnode)) 683 return ENOENT; 684 685 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir)) 686 goto out; 687 688 lockmgr(&devfs_lock, LK_EXCLUSIVE); 689 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Pdir, 690 ap->a_nch->ncp->nc_name, dnode, NULL); 691 692 if (*ap->a_vpp) { 693 node = DEVFS_NODE(*ap->a_vpp); 694 node->flags |= DEVFS_USER_CREATED; 695 cache_setunresolved(ap->a_nch); 696 cache_setvp(ap->a_nch, *ap->a_vpp); 697 } 698 lockmgr(&devfs_lock, LK_RELEASE); 699 out: 700 return ((*ap->a_vpp == NULL) ? ENOTDIR : 0); 701 } 702 703 static int 704 devfs_nsymlink(struct vop_nsymlink_args *ap) 705 { 706 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 707 struct devfs_node *node; 708 size_t targetlen; 709 710 if (!devfs_node_is_accessible(dnode)) 711 return ENOENT; 712 713 ap->a_vap->va_type = VLNK; 714 715 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir)) 716 goto out; 717 718 lockmgr(&devfs_lock, LK_EXCLUSIVE); 719 devfs_allocvp(ap->a_dvp->v_mount, ap->a_vpp, Plink, 720 ap->a_nch->ncp->nc_name, dnode, NULL); 721 722 targetlen = strlen(ap->a_target); 723 if (*ap->a_vpp) { 724 node = DEVFS_NODE(*ap->a_vpp); 725 node->flags |= DEVFS_USER_CREATED; 726 node->symlink_namelen = targetlen; 727 node->symlink_name = kmalloc(targetlen + 1, M_DEVFS, M_WAITOK); 728 memcpy(node->symlink_name, ap->a_target, targetlen); 729 node->symlink_name[targetlen] = '\0'; 730 cache_setunresolved(ap->a_nch); 731 cache_setvp(ap->a_nch, *ap->a_vpp); 732 } 733 lockmgr(&devfs_lock, LK_RELEASE); 734 out: 735 return ((*ap->a_vpp == NULL) ? ENOTDIR : 0); 736 } 737 738 static int 739 devfs_nrmdir(struct vop_nrmdir_args *ap) 740 { 741 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 742 struct devfs_node *node; 743 struct namecache *ncp; 744 int error = ENOENT; 745 746 ncp = ap->a_nch->ncp; 747 748 if (!devfs_node_is_accessible(dnode)) 749 return ENOENT; 750 751 lockmgr(&devfs_lock, LK_EXCLUSIVE); 752 753 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir)) 754 goto out; 755 756 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 757 if (ncp->nc_nlen != node->d_dir.d_namlen) 758 continue; 759 if (memcmp(ncp->nc_name, node->d_dir.d_name, ncp->nc_nlen)) 760 continue; 761 762 /* 763 * only allow removal of user created dirs 764 */ 765 if ((node->flags & DEVFS_USER_CREATED) == 0) { 766 error = EPERM; 767 goto out; 768 } else if (node->node_type != Pdir) { 769 error = ENOTDIR; 770 goto out; 771 } else if (node->nchildren > 2) { 772 error = ENOTEMPTY; 773 goto out; 774 } else { 775 if (node->v_node) 776 cache_inval_vp(node->v_node, CINV_DESTROY); 777 devfs_unlinkp(node); 778 error = 0; 779 break; 780 } 781 } 782 783 cache_setunresolved(ap->a_nch); 784 cache_setvp(ap->a_nch, NULL); 785 786 out: 787 lockmgr(&devfs_lock, LK_RELEASE); 788 return error; 789 } 790 791 static int 792 devfs_nremove(struct vop_nremove_args *ap) 793 { 794 struct devfs_node *dnode = DEVFS_NODE(ap->a_dvp); 795 struct devfs_node *node; 796 struct namecache *ncp; 797 int error = ENOENT; 798 799 ncp = ap->a_nch->ncp; 800 801 if (!devfs_node_is_accessible(dnode)) 802 return ENOENT; 803 804 lockmgr(&devfs_lock, LK_EXCLUSIVE); 805 806 if ((dnode->node_type != Proot) && (dnode->node_type != Pdir)) 807 goto out; 808 809 TAILQ_FOREACH(node, DEVFS_DENODE_HEAD(dnode), link) { 810 if (ncp->nc_nlen != node->d_dir.d_namlen) 811 continue; 812 if (memcmp(ncp->nc_name, node->d_dir.d_name, ncp->nc_nlen)) 813 continue; 814 815 /* 816 * only allow removal of user created stuff (e.g. symlinks) 817 */ 818 if ((node->flags & DEVFS_USER_CREATED) == 0) { 819 error = EPERM; 820 goto out; 821 } else if (node->node_type == Pdir) { 822 error = EISDIR; 823 goto out; 824 } else { 825 if (node->v_node) 826 cache_inval_vp(node->v_node, CINV_DESTROY); 827 devfs_unlinkp(node); 828 error = 0; 829 break; 830 } 831 } 832 833 cache_setunresolved(ap->a_nch); 834 cache_setvp(ap->a_nch, NULL); 835 836 out: 837 lockmgr(&devfs_lock, LK_RELEASE); 838 return error; 839 } 840 841 842 static int 843 devfs_spec_open(struct vop_open_args *ap) 844 { 845 struct vnode *vp = ap->a_vp; 846 struct vnode *orig_vp = NULL; 847 struct devfs_node *node = DEVFS_NODE(vp); 848 struct devfs_node *newnode; 849 cdev_t dev, ndev = NULL; 850 int error = 0; 851 852 if (node) { 853 if (node->d_dev == NULL) 854 return ENXIO; 855 if (!devfs_node_is_accessible(node)) 856 return ENOENT; 857 } 858 859 if ((dev = vp->v_rdev) == NULL) 860 return ENXIO; 861 862 if (node && ap->a_fp) { 863 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_open: -1.1-\n"); 864 lockmgr(&devfs_lock, LK_EXCLUSIVE); 865 866 ndev = devfs_clone(dev, node->d_dir.d_name, node->d_dir.d_namlen, 867 ap->a_mode, ap->a_cred); 868 if (ndev != NULL) { 869 newnode = devfs_create_device_node( 870 DEVFS_MNTDATA(vp->v_mount)->root_node, 871 ndev, NULL, NULL); 872 /* XXX: possibly destroy device if this happens */ 873 874 if (newnode != NULL) { 875 dev = ndev; 876 devfs_link_dev(dev); 877 878 devfs_debug(DEVFS_DEBUG_DEBUG, 879 "parent here is: %s, node is: |%s|\n", 880 ((node->parent->node_type == Proot) ? 881 "ROOT!" : node->parent->d_dir.d_name), 882 newnode->d_dir.d_name); 883 devfs_debug(DEVFS_DEBUG_DEBUG, 884 "test: %s\n", 885 ((struct devfs_node *)(TAILQ_LAST(DEVFS_DENODE_HEAD(node->parent), devfs_node_head)))->d_dir.d_name); 886 887 /* 888 * orig_vp is set to the original vp if we cloned. 889 */ 890 /* node->flags |= DEVFS_CLONED; */ 891 devfs_allocv(&vp, newnode); 892 orig_vp = ap->a_vp; 893 ap->a_vp = vp; 894 } 895 } 896 lockmgr(&devfs_lock, LK_RELEASE); 897 } 898 899 devfs_debug(DEVFS_DEBUG_DEBUG, 900 "devfs_spec_open() called on %s! \n", 901 dev->si_name); 902 903 /* 904 * Make this field valid before any I/O in ->d_open 905 */ 906 if (!dev->si_iosize_max) 907 dev->si_iosize_max = DFLTPHYS; 908 909 if (dev_dflags(dev) & D_TTY) 910 vsetflags(vp, VISTTY); 911 912 vn_unlock(vp); 913 error = dev_dopen(dev, ap->a_mode, S_IFCHR, ap->a_cred); 914 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 915 916 /* 917 * Clean up any cloned vp if we error out. 918 */ 919 if (error) { 920 if (orig_vp) { 921 vput(vp); 922 ap->a_vp = orig_vp; 923 /* orig_vp = NULL; */ 924 } 925 return error; 926 } 927 928 /* 929 * This checks if the disk device is going to be opened for writing. 930 * It will be only allowed in the cases where securelevel permits it 931 * and it's not mounted R/W. 932 */ 933 if ((dev_dflags(dev) & D_DISK) && (ap->a_mode & FWRITE) && 934 (ap->a_cred != FSCRED)) { 935 936 /* Very secure mode. No open for writing allowed */ 937 if (securelevel >= 2) 938 return EPERM; 939 940 /* 941 * If it is mounted R/W, do not allow to open for writing. 942 * In the case it's mounted read-only but securelevel 943 * is >= 1, then do not allow opening for writing either. 944 */ 945 if (vfs_mountedon(vp)) { 946 if (!(dev->si_mountpoint->mnt_flag & MNT_RDONLY)) 947 return EBUSY; 948 else if (securelevel >= 1) 949 return EPERM; 950 } 951 } 952 953 if (dev_dflags(dev) & D_TTY) { 954 if (dev->si_tty) { 955 struct tty *tp; 956 tp = dev->si_tty; 957 if (!tp->t_stop) { 958 devfs_debug(DEVFS_DEBUG_DEBUG, 959 "devfs: no t_stop\n"); 960 tp->t_stop = nottystop; 961 } 962 } 963 } 964 965 966 if (vn_isdisk(vp, NULL)) { 967 if (!dev->si_bsize_phys) 968 dev->si_bsize_phys = DEV_BSIZE; 969 vinitvmio(vp, IDX_TO_OFF(INT_MAX), PAGE_SIZE, -1); 970 } 971 972 vop_stdopen(ap); 973 #if 0 974 if (node) 975 nanotime(&node->atime); 976 #endif 977 978 /* 979 * If we replaced the vp the vop_stdopen() call will have loaded 980 * it into fp->f_data and vref()d the vp, giving us two refs. So 981 * instead of just unlocking it here we have to vput() it. 982 */ 983 if (orig_vp) 984 vput(vp); 985 986 /* Ugly pty magic, to make pty devices appear once they are opened */ 987 if (node && (node->flags & DEVFS_PTY) == DEVFS_PTY) 988 node->flags &= ~DEVFS_INVISIBLE; 989 990 if (ap->a_fp) { 991 KKASSERT(ap->a_fp->f_type == DTYPE_VNODE); 992 KKASSERT(ap->a_fp->f_flag == (ap->a_mode & FMASK)); 993 ap->a_fp->f_ops = &devfs_dev_fileops; 994 KKASSERT(ap->a_fp->f_data == (void *)vp); 995 } 996 997 return 0; 998 } 999 1000 1001 static int 1002 devfs_spec_close(struct vop_close_args *ap) 1003 { 1004 struct devfs_node *node = DEVFS_NODE(ap->a_vp); 1005 struct proc *p = curproc; 1006 struct vnode *vp = ap->a_vp; 1007 cdev_t dev = vp->v_rdev; 1008 int error = 0; 1009 int needrelock; 1010 1011 devfs_debug(DEVFS_DEBUG_DEBUG, 1012 "devfs_spec_close() called on %s! \n", 1013 dev->si_name); 1014 1015 /* 1016 * A couple of hacks for devices and tty devices. The 1017 * vnode ref count cannot be used to figure out the 1018 * last close, but we can use v_opencount now that 1019 * revoke works properly. 1020 * 1021 * Detect the last close on a controlling terminal and clear 1022 * the session (half-close). 1023 */ 1024 if (dev) 1025 reference_dev(dev); 1026 1027 if (p && vp->v_opencount <= 1 && vp == p->p_session->s_ttyvp) { 1028 p->p_session->s_ttyvp = NULL; 1029 vrele(vp); 1030 } 1031 1032 /* 1033 * Vnodes can be opened and closed multiple times. Do not really 1034 * close the device unless (1) it is being closed forcibly, 1035 * (2) the device wants to track closes, or (3) this is the last 1036 * vnode doing its last close on the device. 1037 * 1038 * XXX the VXLOCK (force close) case can leave vnodes referencing 1039 * a closed device. This might not occur now that our revoke is 1040 * fixed. 1041 */ 1042 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -1- \n"); 1043 if (dev && ((vp->v_flag & VRECLAIMED) || 1044 (dev_dflags(dev) & D_TRACKCLOSE) || 1045 (vp->v_opencount == 1))) { 1046 /* 1047 * Unlock around dev_dclose() 1048 */ 1049 needrelock = 0; 1050 if (vn_islocked(vp)) { 1051 needrelock = 1; 1052 vn_unlock(vp); 1053 } 1054 error = dev_dclose(dev, ap->a_fflag, S_IFCHR); 1055 1056 /* 1057 * Ugly pty magic, to make pty devices disappear again once 1058 * they are closed 1059 */ 1060 if (node && (node->flags & DEVFS_PTY) == DEVFS_PTY) 1061 node->flags |= DEVFS_INVISIBLE; 1062 1063 if (needrelock) 1064 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1065 } else { 1066 error = 0; 1067 } 1068 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_spec_close() -2- \n"); 1069 1070 /* 1071 * Track the actual opens and closes on the vnode. The last close 1072 * disassociates the rdev. If the rdev is already disassociated or 1073 * the opencount is already 0, the vnode might have been revoked 1074 * and no further opencount tracking occurs. 1075 */ 1076 if (dev) 1077 release_dev(dev); 1078 if (vp->v_opencount > 0) 1079 vop_stdclose(ap); 1080 return(error); 1081 1082 } 1083 1084 1085 static int 1086 devfs_specf_close(struct file *fp) 1087 { 1088 struct vnode *vp = (struct vnode *)fp->f_data; 1089 int error; 1090 1091 get_mplock(); 1092 fp->f_ops = &badfileops; 1093 error = vn_close(vp, fp->f_flag); 1094 rel_mplock(); 1095 1096 return (error); 1097 } 1098 1099 1100 /* 1101 * Device-optimized file table vnode read routine. 1102 * 1103 * This bypasses the VOP table and talks directly to the device. Most 1104 * filesystems just route to specfs and can make this optimization. 1105 * 1106 * MPALMOSTSAFE - acquires mplock 1107 */ 1108 static int 1109 devfs_specf_read(struct file *fp, struct uio *uio, 1110 struct ucred *cred, int flags) 1111 { 1112 struct devfs_node *node; 1113 struct vnode *vp; 1114 int ioflag; 1115 int error; 1116 cdev_t dev; 1117 1118 KASSERT(uio->uio_td == curthread, 1119 ("uio_td %p is not td %p", uio->uio_td, curthread)); 1120 1121 if (uio->uio_resid == 0) 1122 return 0; 1123 1124 vp = (struct vnode *)fp->f_data; 1125 if (vp == NULL || vp->v_type == VBAD) 1126 return EBADF; 1127 1128 node = DEVFS_NODE(vp); 1129 1130 if ((dev = vp->v_rdev) == NULL) 1131 return EBADF; 1132 1133 /* only acquire mplock for devices that require it */ 1134 if (!(dev_dflags(dev) & D_MPSAFE_READ)) { 1135 atomic_add_int(&mplock_reads, 1); 1136 get_mplock(); 1137 } else { 1138 atomic_add_int(&mpsafe_reads, 1); 1139 } 1140 1141 reference_dev(dev); 1142 1143 if ((flags & O_FOFFSET) == 0) 1144 uio->uio_offset = fp->f_offset; 1145 1146 ioflag = 0; 1147 if (flags & O_FBLOCKING) { 1148 /* ioflag &= ~IO_NDELAY; */ 1149 } else if (flags & O_FNONBLOCKING) { 1150 ioflag |= IO_NDELAY; 1151 } else if (fp->f_flag & FNONBLOCK) { 1152 ioflag |= IO_NDELAY; 1153 } 1154 if (flags & O_FBUFFERED) { 1155 /* ioflag &= ~IO_DIRECT; */ 1156 } else if (flags & O_FUNBUFFERED) { 1157 ioflag |= IO_DIRECT; 1158 } else if (fp->f_flag & O_DIRECT) { 1159 ioflag |= IO_DIRECT; 1160 } 1161 ioflag |= sequential_heuristic(uio, fp); 1162 1163 error = dev_dread(dev, uio, ioflag); 1164 1165 release_dev(dev); 1166 if (node) 1167 nanotime(&node->atime); 1168 if ((flags & O_FOFFSET) == 0) 1169 fp->f_offset = uio->uio_offset; 1170 fp->f_nextoff = uio->uio_offset; 1171 1172 if (!(dev_dflags(dev) & D_MPSAFE_READ)) 1173 rel_mplock(); 1174 1175 return (error); 1176 } 1177 1178 1179 static int 1180 devfs_specf_write(struct file *fp, struct uio *uio, 1181 struct ucred *cred, int flags) 1182 { 1183 struct devfs_node *node; 1184 struct vnode *vp; 1185 int ioflag; 1186 int error; 1187 cdev_t dev; 1188 1189 KASSERT(uio->uio_td == curthread, 1190 ("uio_td %p is not p %p", uio->uio_td, curthread)); 1191 1192 vp = (struct vnode *)fp->f_data; 1193 if (vp == NULL || vp->v_type == VBAD) 1194 return EBADF; 1195 1196 node = DEVFS_NODE(vp); 1197 1198 if (vp->v_type == VREG) 1199 bwillwrite(uio->uio_resid); 1200 1201 vp = (struct vnode *)fp->f_data; 1202 1203 if ((dev = vp->v_rdev) == NULL) 1204 return EBADF; 1205 1206 /* only acquire mplock for devices that require it */ 1207 if (!(dev_dflags(dev) & D_MPSAFE_WRITE)) { 1208 atomic_add_int(&mplock_writes, 1); 1209 get_mplock(); 1210 } else { 1211 atomic_add_int(&mpsafe_writes, 1); 1212 } 1213 1214 reference_dev(dev); 1215 1216 if ((flags & O_FOFFSET) == 0) 1217 uio->uio_offset = fp->f_offset; 1218 1219 ioflag = IO_UNIT; 1220 if (vp->v_type == VREG && 1221 ((fp->f_flag & O_APPEND) || (flags & O_FAPPEND))) { 1222 ioflag |= IO_APPEND; 1223 } 1224 1225 if (flags & O_FBLOCKING) { 1226 /* ioflag &= ~IO_NDELAY; */ 1227 } else if (flags & O_FNONBLOCKING) { 1228 ioflag |= IO_NDELAY; 1229 } else if (fp->f_flag & FNONBLOCK) { 1230 ioflag |= IO_NDELAY; 1231 } 1232 if (flags & O_FBUFFERED) { 1233 /* ioflag &= ~IO_DIRECT; */ 1234 } else if (flags & O_FUNBUFFERED) { 1235 ioflag |= IO_DIRECT; 1236 } else if (fp->f_flag & O_DIRECT) { 1237 ioflag |= IO_DIRECT; 1238 } 1239 if (flags & O_FASYNCWRITE) { 1240 /* ioflag &= ~IO_SYNC; */ 1241 } else if (flags & O_FSYNCWRITE) { 1242 ioflag |= IO_SYNC; 1243 } else if (fp->f_flag & O_FSYNC) { 1244 ioflag |= IO_SYNC; 1245 } 1246 1247 if (vp->v_mount && (vp->v_mount->mnt_flag & MNT_SYNCHRONOUS)) 1248 ioflag |= IO_SYNC; 1249 ioflag |= sequential_heuristic(uio, fp); 1250 1251 error = dev_dwrite(dev, uio, ioflag); 1252 1253 release_dev(dev); 1254 if (node) { 1255 nanotime(&node->atime); 1256 nanotime(&node->mtime); 1257 } 1258 1259 if ((flags & O_FOFFSET) == 0) 1260 fp->f_offset = uio->uio_offset; 1261 fp->f_nextoff = uio->uio_offset; 1262 1263 if (!(dev_dflags(dev) & D_MPSAFE_WRITE)) 1264 rel_mplock(); 1265 return (error); 1266 } 1267 1268 1269 static int 1270 devfs_specf_stat(struct file *fp, struct stat *sb, struct ucred *cred) 1271 { 1272 struct vnode *vp; 1273 struct vattr vattr; 1274 struct vattr *vap; 1275 u_short mode; 1276 cdev_t dev; 1277 int error; 1278 1279 vp = (struct vnode *)fp->f_data; 1280 if (vp == NULL || vp->v_type == VBAD) 1281 return EBADF; 1282 1283 error = vn_stat(vp, sb, cred); 1284 if (error) 1285 return (error); 1286 1287 vap = &vattr; 1288 error = VOP_GETATTR(vp, vap); 1289 if (error) 1290 return (error); 1291 1292 /* 1293 * Zero the spare stat fields 1294 */ 1295 sb->st_lspare = 0; 1296 sb->st_qspare1 = 0; 1297 sb->st_qspare2 = 0; 1298 1299 /* 1300 * Copy from vattr table ... or not in case it's a cloned device 1301 */ 1302 if (vap->va_fsid != VNOVAL) 1303 sb->st_dev = vap->va_fsid; 1304 else 1305 sb->st_dev = vp->v_mount->mnt_stat.f_fsid.val[0]; 1306 1307 sb->st_ino = vap->va_fileid; 1308 1309 mode = vap->va_mode; 1310 mode |= S_IFCHR; 1311 sb->st_mode = mode; 1312 1313 if (vap->va_nlink > (nlink_t)-1) 1314 sb->st_nlink = (nlink_t)-1; 1315 else 1316 sb->st_nlink = vap->va_nlink; 1317 1318 sb->st_uid = vap->va_uid; 1319 sb->st_gid = vap->va_gid; 1320 sb->st_rdev = dev2udev(DEVFS_NODE(vp)->d_dev); 1321 sb->st_size = vap->va_bytes; 1322 sb->st_atimespec = vap->va_atime; 1323 sb->st_mtimespec = vap->va_mtime; 1324 sb->st_ctimespec = vap->va_ctime; 1325 1326 /* 1327 * A VCHR and VBLK device may track the last access and last modified 1328 * time independantly of the filesystem. This is particularly true 1329 * because device read and write calls may bypass the filesystem. 1330 */ 1331 if (vp->v_type == VCHR || vp->v_type == VBLK) { 1332 dev = vp->v_rdev; 1333 if (dev != NULL) { 1334 if (dev->si_lastread) { 1335 sb->st_atimespec.tv_sec = dev->si_lastread; 1336 sb->st_atimespec.tv_nsec = 0; 1337 } 1338 if (dev->si_lastwrite) { 1339 sb->st_atimespec.tv_sec = dev->si_lastwrite; 1340 sb->st_atimespec.tv_nsec = 0; 1341 } 1342 } 1343 } 1344 1345 /* 1346 * According to www.opengroup.org, the meaning of st_blksize is 1347 * "a filesystem-specific preferred I/O block size for this 1348 * object. In some filesystem types, this may vary from file 1349 * to file" 1350 * Default to PAGE_SIZE after much discussion. 1351 */ 1352 1353 sb->st_blksize = PAGE_SIZE; 1354 1355 sb->st_flags = vap->va_flags; 1356 1357 error = priv_check_cred(cred, PRIV_VFS_GENERATION, 0); 1358 if (error) 1359 sb->st_gen = 0; 1360 else 1361 sb->st_gen = (u_int32_t)vap->va_gen; 1362 1363 sb->st_blocks = vap->va_bytes / S_BLKSIZE; 1364 1365 return (0); 1366 } 1367 1368 1369 static int 1370 devfs_specf_kqfilter(struct file *fp, struct knote *kn) 1371 { 1372 struct vnode *vp; 1373 int error; 1374 cdev_t dev; 1375 1376 get_mplock(); 1377 1378 vp = (struct vnode *)fp->f_data; 1379 if (vp == NULL || vp->v_type == VBAD) { 1380 error = EBADF; 1381 goto done; 1382 } 1383 if ((dev = vp->v_rdev) == NULL) { 1384 error = EBADF; 1385 goto done; 1386 } 1387 reference_dev(dev); 1388 1389 error = dev_dkqfilter(dev, kn); 1390 1391 release_dev(dev); 1392 1393 done: 1394 rel_mplock(); 1395 return (error); 1396 } 1397 1398 /* 1399 * MPALMOSTSAFE - acquires mplock 1400 */ 1401 static int 1402 devfs_specf_ioctl(struct file *fp, u_long com, caddr_t data, 1403 struct ucred *ucred, struct sysmsg *msg) 1404 { 1405 struct devfs_node *node; 1406 struct vnode *vp; 1407 struct vnode *ovp; 1408 cdev_t dev; 1409 int error; 1410 struct fiodname_args *name_args; 1411 size_t namlen; 1412 const char *name; 1413 1414 vp = ((struct vnode *)fp->f_data); 1415 1416 if ((dev = vp->v_rdev) == NULL) 1417 return EBADF; /* device was revoked */ 1418 1419 reference_dev(dev); 1420 1421 node = DEVFS_NODE(vp); 1422 1423 devfs_debug(DEVFS_DEBUG_DEBUG, 1424 "devfs_specf_ioctl() called! for dev %s\n", 1425 dev->si_name); 1426 1427 if (com == FIODTYPE) { 1428 *(int *)data = dev_dflags(dev) & D_TYPEMASK; 1429 error = 0; 1430 goto out; 1431 } else if (com == FIODNAME) { 1432 name_args = (struct fiodname_args *)data; 1433 name = dev->si_name; 1434 namlen = strlen(name) + 1; 1435 1436 devfs_debug(DEVFS_DEBUG_DEBUG, 1437 "ioctl, got: FIODNAME for %s\n", name); 1438 1439 if (namlen <= name_args->len) 1440 error = copyout(dev->si_name, name_args->name, namlen); 1441 else 1442 error = EINVAL; 1443 1444 devfs_debug(DEVFS_DEBUG_DEBUG, 1445 "ioctl stuff: error: %d\n", error); 1446 goto out; 1447 } 1448 1449 /* only acquire mplock for devices that require it */ 1450 if (!(dev_dflags(dev) & D_MPSAFE_IOCTL)) 1451 get_mplock(); 1452 1453 error = dev_dioctl(dev, com, data, fp->f_flag, ucred, msg); 1454 1455 #if 0 1456 if (node) { 1457 nanotime(&node->atime); 1458 nanotime(&node->mtime); 1459 } 1460 #endif 1461 1462 if (!(dev_dflags(dev) & D_MPSAFE_IOCTL)) 1463 rel_mplock(); 1464 1465 if (com == TIOCSCTTY) { 1466 devfs_debug(DEVFS_DEBUG_DEBUG, 1467 "devfs_specf_ioctl: got TIOCSCTTY on %s\n", 1468 dev->si_name); 1469 } 1470 if (error == 0 && com == TIOCSCTTY) { 1471 struct proc *p = curthread->td_proc; 1472 struct session *sess; 1473 1474 devfs_debug(DEVFS_DEBUG_DEBUG, 1475 "devfs_specf_ioctl: dealing with TIOCSCTTY on %s\n", 1476 dev->si_name); 1477 if (p == NULL) { 1478 error = ENOTTY; 1479 goto out; 1480 } 1481 sess = p->p_session; 1482 1483 /* 1484 * Do nothing if reassigning same control tty 1485 */ 1486 if (sess->s_ttyvp == vp) { 1487 error = 0; 1488 goto out; 1489 } 1490 1491 /* 1492 * Get rid of reference to old control tty 1493 */ 1494 ovp = sess->s_ttyvp; 1495 vref(vp); 1496 sess->s_ttyvp = vp; 1497 if (ovp) 1498 vrele(ovp); 1499 } 1500 1501 out: 1502 release_dev(dev); 1503 devfs_debug(DEVFS_DEBUG_DEBUG, "devfs_specf_ioctl() finished! \n"); 1504 return (error); 1505 } 1506 1507 1508 static int 1509 devfs_spec_fsync(struct vop_fsync_args *ap) 1510 { 1511 struct vnode *vp = ap->a_vp; 1512 int error; 1513 1514 if (!vn_isdisk(vp, NULL)) 1515 return (0); 1516 1517 /* 1518 * Flush all dirty buffers associated with a block device. 1519 */ 1520 error = vfsync(vp, ap->a_waitfor, 10000, NULL, NULL); 1521 return (error); 1522 } 1523 1524 static int 1525 devfs_spec_read(struct vop_read_args *ap) 1526 { 1527 struct devfs_node *node; 1528 struct vnode *vp; 1529 struct uio *uio; 1530 cdev_t dev; 1531 int error; 1532 1533 vp = ap->a_vp; 1534 dev = vp->v_rdev; 1535 uio = ap->a_uio; 1536 node = DEVFS_NODE(vp); 1537 1538 if (dev == NULL) /* device was revoked */ 1539 return (EBADF); 1540 if (uio->uio_resid == 0) 1541 return (0); 1542 1543 vn_unlock(vp); 1544 error = dev_dread(dev, uio, ap->a_ioflag); 1545 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1546 1547 if (node) 1548 nanotime(&node->atime); 1549 1550 return (error); 1551 } 1552 1553 /* 1554 * Vnode op for write 1555 * 1556 * spec_write(struct vnode *a_vp, struct uio *a_uio, int a_ioflag, 1557 * struct ucred *a_cred) 1558 */ 1559 static int 1560 devfs_spec_write(struct vop_write_args *ap) 1561 { 1562 struct devfs_node *node; 1563 struct vnode *vp; 1564 struct uio *uio; 1565 cdev_t dev; 1566 int error; 1567 1568 vp = ap->a_vp; 1569 dev = vp->v_rdev; 1570 uio = ap->a_uio; 1571 node = DEVFS_NODE(vp); 1572 1573 KKASSERT(uio->uio_segflg != UIO_NOCOPY); 1574 1575 if (dev == NULL) /* device was revoked */ 1576 return (EBADF); 1577 1578 vn_unlock(vp); 1579 error = dev_dwrite(dev, uio, ap->a_ioflag); 1580 vn_lock(vp, LK_EXCLUSIVE | LK_RETRY); 1581 1582 if (node) { 1583 nanotime(&node->atime); 1584 nanotime(&node->mtime); 1585 } 1586 1587 return (error); 1588 } 1589 1590 /* 1591 * Device ioctl operation. 1592 * 1593 * spec_ioctl(struct vnode *a_vp, int a_command, caddr_t a_data, 1594 * int a_fflag, struct ucred *a_cred, struct sysmsg *msg) 1595 */ 1596 static int 1597 devfs_spec_ioctl(struct vop_ioctl_args *ap) 1598 { 1599 struct vnode *vp = ap->a_vp; 1600 struct devfs_node *node; 1601 cdev_t dev; 1602 1603 if ((dev = vp->v_rdev) == NULL) 1604 return (EBADF); /* device was revoked */ 1605 node = DEVFS_NODE(vp); 1606 1607 #if 0 1608 if (node) { 1609 nanotime(&node->atime); 1610 nanotime(&node->mtime); 1611 } 1612 #endif 1613 1614 return (dev_dioctl(dev, ap->a_command, ap->a_data, ap->a_fflag, 1615 ap->a_cred, ap->a_sysmsg)); 1616 } 1617 1618 /* 1619 * spec_kqfilter(struct vnode *a_vp, struct knote *a_kn) 1620 */ 1621 /* ARGSUSED */ 1622 static int 1623 devfs_spec_kqfilter(struct vop_kqfilter_args *ap) 1624 { 1625 struct vnode *vp = ap->a_vp; 1626 struct devfs_node *node; 1627 cdev_t dev; 1628 1629 if ((dev = vp->v_rdev) == NULL) 1630 return (EBADF); /* device was revoked (EBADF) */ 1631 node = DEVFS_NODE(vp); 1632 1633 #if 0 1634 if (node) 1635 nanotime(&node->atime); 1636 #endif 1637 1638 return (dev_dkqfilter(dev, ap->a_kn)); 1639 } 1640 1641 /* 1642 * Convert a vnode strategy call into a device strategy call. Vnode strategy 1643 * calls are not limited to device DMA limits so we have to deal with the 1644 * case. 1645 * 1646 * spec_strategy(struct vnode *a_vp, struct bio *a_bio) 1647 */ 1648 static int 1649 devfs_spec_strategy(struct vop_strategy_args *ap) 1650 { 1651 struct bio *bio = ap->a_bio; 1652 struct buf *bp = bio->bio_buf; 1653 struct buf *nbp; 1654 struct vnode *vp; 1655 struct mount *mp; 1656 int chunksize; 1657 int maxiosize; 1658 1659 if (bp->b_cmd != BUF_CMD_READ && LIST_FIRST(&bp->b_dep) != NULL) 1660 buf_start(bp); 1661 1662 /* 1663 * Collect statistics on synchronous and asynchronous read 1664 * and write counts for disks that have associated filesystems. 1665 */ 1666 vp = ap->a_vp; 1667 KKASSERT(vp->v_rdev != NULL); /* XXX */ 1668 if (vn_isdisk(vp, NULL) && (mp = vp->v_rdev->si_mountpoint) != NULL) { 1669 if (bp->b_cmd == BUF_CMD_READ) { 1670 if (bp->b_flags & BIO_SYNC) 1671 mp->mnt_stat.f_syncreads++; 1672 else 1673 mp->mnt_stat.f_asyncreads++; 1674 } else { 1675 if (bp->b_flags & BIO_SYNC) 1676 mp->mnt_stat.f_syncwrites++; 1677 else 1678 mp->mnt_stat.f_asyncwrites++; 1679 } 1680 } 1681 1682 /* 1683 * Device iosize limitations only apply to read and write. Shortcut 1684 * the I/O if it fits. 1685 */ 1686 if ((maxiosize = vp->v_rdev->si_iosize_max) == 0) { 1687 devfs_debug(DEVFS_DEBUG_DEBUG, 1688 "%s: si_iosize_max not set!\n", 1689 dev_dname(vp->v_rdev)); 1690 maxiosize = MAXPHYS; 1691 } 1692 #if SPEC_CHAIN_DEBUG & 2 1693 maxiosize = 4096; 1694 #endif 1695 if (bp->b_bcount <= maxiosize || 1696 (bp->b_cmd != BUF_CMD_READ && bp->b_cmd != BUF_CMD_WRITE)) { 1697 dev_dstrategy_chain(vp->v_rdev, bio); 1698 return (0); 1699 } 1700 1701 /* 1702 * Clone the buffer and set up an I/O chain to chunk up the I/O. 1703 */ 1704 nbp = kmalloc(sizeof(*bp), M_DEVBUF, M_INTWAIT|M_ZERO); 1705 initbufbio(nbp); 1706 buf_dep_init(nbp); 1707 BUF_LOCKINIT(nbp); 1708 BUF_LOCK(nbp, LK_EXCLUSIVE); 1709 BUF_KERNPROC(nbp); 1710 nbp->b_vp = vp; 1711 nbp->b_flags = B_PAGING | (bp->b_flags & B_BNOCLIP); 1712 nbp->b_data = bp->b_data; 1713 nbp->b_bio1.bio_done = devfs_spec_strategy_done; 1714 nbp->b_bio1.bio_offset = bio->bio_offset; 1715 nbp->b_bio1.bio_caller_info1.ptr = bio; 1716 1717 /* 1718 * Start the first transfer 1719 */ 1720 if (vn_isdisk(vp, NULL)) 1721 chunksize = vp->v_rdev->si_bsize_phys; 1722 else 1723 chunksize = DEV_BSIZE; 1724 chunksize = maxiosize / chunksize * chunksize; 1725 #if SPEC_CHAIN_DEBUG & 1 1726 devfs_debug(DEVFS_DEBUG_DEBUG, 1727 "spec_strategy chained I/O chunksize=%d\n", 1728 chunksize); 1729 #endif 1730 nbp->b_cmd = bp->b_cmd; 1731 nbp->b_bcount = chunksize; 1732 nbp->b_bufsize = chunksize; /* used to detect a short I/O */ 1733 nbp->b_bio1.bio_caller_info2.index = chunksize; 1734 1735 #if SPEC_CHAIN_DEBUG & 1 1736 devfs_debug(DEVFS_DEBUG_DEBUG, 1737 "spec_strategy: chain %p offset %d/%d bcount %d\n", 1738 bp, 0, bp->b_bcount, nbp->b_bcount); 1739 #endif 1740 1741 dev_dstrategy(vp->v_rdev, &nbp->b_bio1); 1742 1743 if (DEVFS_NODE(vp)) { 1744 nanotime(&DEVFS_NODE(vp)->atime); 1745 nanotime(&DEVFS_NODE(vp)->mtime); 1746 } 1747 1748 return (0); 1749 } 1750 1751 /* 1752 * Chunked up transfer completion routine - chain transfers until done 1753 */ 1754 static 1755 void 1756 devfs_spec_strategy_done(struct bio *nbio) 1757 { 1758 struct buf *nbp = nbio->bio_buf; 1759 struct bio *bio = nbio->bio_caller_info1.ptr; /* original bio */ 1760 struct buf *bp = bio->bio_buf; /* original bp */ 1761 int chunksize = nbio->bio_caller_info2.index; /* chunking */ 1762 int boffset = nbp->b_data - bp->b_data; 1763 1764 if (nbp->b_flags & B_ERROR) { 1765 /* 1766 * An error terminates the chain, propogate the error back 1767 * to the original bp 1768 */ 1769 bp->b_flags |= B_ERROR; 1770 bp->b_error = nbp->b_error; 1771 bp->b_resid = bp->b_bcount - boffset + 1772 (nbp->b_bcount - nbp->b_resid); 1773 #if SPEC_CHAIN_DEBUG & 1 1774 devfs_debug(DEVFS_DEBUG_DEBUG, 1775 "spec_strategy: chain %p error %d bcount %d/%d\n", 1776 bp, bp->b_error, bp->b_bcount, 1777 bp->b_bcount - bp->b_resid); 1778 #endif 1779 kfree(nbp, M_DEVBUF); 1780 biodone(bio); 1781 } else if (nbp->b_resid) { 1782 /* 1783 * A short read or write terminates the chain 1784 */ 1785 bp->b_error = nbp->b_error; 1786 bp->b_resid = bp->b_bcount - boffset + 1787 (nbp->b_bcount - nbp->b_resid); 1788 #if SPEC_CHAIN_DEBUG & 1 1789 devfs_debug(DEVFS_DEBUG_DEBUG, 1790 "spec_strategy: chain %p short read(1) " 1791 "bcount %d/%d\n", 1792 bp, bp->b_bcount - bp->b_resid, bp->b_bcount); 1793 #endif 1794 kfree(nbp, M_DEVBUF); 1795 biodone(bio); 1796 } else if (nbp->b_bcount != nbp->b_bufsize) { 1797 /* 1798 * A short read or write can also occur by truncating b_bcount 1799 */ 1800 #if SPEC_CHAIN_DEBUG & 1 1801 devfs_debug(DEVFS_DEBUG_DEBUG, 1802 "spec_strategy: chain %p short read(2) " 1803 "bcount %d/%d\n", 1804 bp, nbp->b_bcount + boffset, bp->b_bcount); 1805 #endif 1806 bp->b_error = 0; 1807 bp->b_bcount = nbp->b_bcount + boffset; 1808 bp->b_resid = nbp->b_resid; 1809 kfree(nbp, M_DEVBUF); 1810 biodone(bio); 1811 } else if (nbp->b_bcount + boffset == bp->b_bcount) { 1812 /* 1813 * No more data terminates the chain 1814 */ 1815 #if SPEC_CHAIN_DEBUG & 1 1816 devfs_debug(DEVFS_DEBUG_DEBUG, 1817 "spec_strategy: chain %p finished bcount %d\n", 1818 bp, bp->b_bcount); 1819 #endif 1820 bp->b_error = 0; 1821 bp->b_resid = 0; 1822 kfree(nbp, M_DEVBUF); 1823 biodone(bio); 1824 } else { 1825 /* 1826 * Continue the chain 1827 */ 1828 boffset += nbp->b_bcount; 1829 nbp->b_data = bp->b_data + boffset; 1830 nbp->b_bcount = bp->b_bcount - boffset; 1831 if (nbp->b_bcount > chunksize) 1832 nbp->b_bcount = chunksize; 1833 nbp->b_bio1.bio_done = devfs_spec_strategy_done; 1834 nbp->b_bio1.bio_offset = bio->bio_offset + boffset; 1835 1836 #if SPEC_CHAIN_DEBUG & 1 1837 devfs_debug(DEVFS_DEBUG_DEBUG, 1838 "spec_strategy: chain %p offset %d/%d bcount %d\n", 1839 bp, boffset, bp->b_bcount, nbp->b_bcount); 1840 #endif 1841 1842 dev_dstrategy(nbp->b_vp->v_rdev, &nbp->b_bio1); 1843 } 1844 } 1845 1846 /* 1847 * spec_freeblks(struct vnode *a_vp, daddr_t a_addr, daddr_t a_length) 1848 */ 1849 static int 1850 devfs_spec_freeblks(struct vop_freeblks_args *ap) 1851 { 1852 struct buf *bp; 1853 1854 /* 1855 * XXX: This assumes that strategy does the deed right away. 1856 * XXX: this may not be TRTTD. 1857 */ 1858 KKASSERT(ap->a_vp->v_rdev != NULL); 1859 if ((dev_dflags(ap->a_vp->v_rdev) & D_CANFREE) == 0) 1860 return (0); 1861 bp = geteblk(ap->a_length); 1862 bp->b_cmd = BUF_CMD_FREEBLKS; 1863 bp->b_bio1.bio_offset = ap->a_offset; 1864 bp->b_bcount = ap->a_length; 1865 dev_dstrategy(ap->a_vp->v_rdev, &bp->b_bio1); 1866 return (0); 1867 } 1868 1869 /* 1870 * Implement degenerate case where the block requested is the block 1871 * returned, and assume that the entire device is contiguous in regards 1872 * to the contiguous block range (runp and runb). 1873 * 1874 * spec_bmap(struct vnode *a_vp, off_t a_loffset, 1875 * off_t *a_doffsetp, int *a_runp, int *a_runb) 1876 */ 1877 static int 1878 devfs_spec_bmap(struct vop_bmap_args *ap) 1879 { 1880 if (ap->a_doffsetp != NULL) 1881 *ap->a_doffsetp = ap->a_loffset; 1882 if (ap->a_runp != NULL) 1883 *ap->a_runp = MAXBSIZE; 1884 if (ap->a_runb != NULL) { 1885 if (ap->a_loffset < MAXBSIZE) 1886 *ap->a_runb = (int)ap->a_loffset; 1887 else 1888 *ap->a_runb = MAXBSIZE; 1889 } 1890 return (0); 1891 } 1892 1893 1894 /* 1895 * Special device advisory byte-level locks. 1896 * 1897 * spec_advlock(struct vnode *a_vp, caddr_t a_id, int a_op, 1898 * struct flock *a_fl, int a_flags) 1899 */ 1900 /* ARGSUSED */ 1901 static int 1902 devfs_spec_advlock(struct vop_advlock_args *ap) 1903 { 1904 return ((ap->a_flags & F_POSIX) ? EINVAL : EOPNOTSUPP); 1905 } 1906 1907 static void 1908 devfs_spec_getpages_iodone(struct bio *bio) 1909 { 1910 bio->bio_buf->b_cmd = BUF_CMD_DONE; 1911 wakeup(bio->bio_buf); 1912 } 1913 1914 /* 1915 * spec_getpages() - get pages associated with device vnode. 1916 * 1917 * Note that spec_read and spec_write do not use the buffer cache, so we 1918 * must fully implement getpages here. 1919 */ 1920 static int 1921 devfs_spec_getpages(struct vop_getpages_args *ap) 1922 { 1923 vm_offset_t kva; 1924 int error; 1925 int i, pcount, size; 1926 struct buf *bp; 1927 vm_page_t m; 1928 vm_ooffset_t offset; 1929 int toff, nextoff, nread; 1930 struct vnode *vp = ap->a_vp; 1931 int blksiz; 1932 int gotreqpage; 1933 1934 error = 0; 1935 pcount = round_page(ap->a_count) / PAGE_SIZE; 1936 1937 /* 1938 * Calculate the offset of the transfer and do sanity check. 1939 */ 1940 offset = IDX_TO_OFF(ap->a_m[0]->pindex) + ap->a_offset; 1941 1942 /* 1943 * Round up physical size for real devices. We cannot round using 1944 * v_mount's block size data because v_mount has nothing to do with 1945 * the device. i.e. it's usually '/dev'. We need the physical block 1946 * size for the device itself. 1947 * 1948 * We can't use v_rdev->si_mountpoint because it only exists when the 1949 * block device is mounted. However, we can use v_rdev. 1950 */ 1951 if (vn_isdisk(vp, NULL)) 1952 blksiz = vp->v_rdev->si_bsize_phys; 1953 else 1954 blksiz = DEV_BSIZE; 1955 1956 size = (ap->a_count + blksiz - 1) & ~(blksiz - 1); 1957 1958 bp = getpbuf(NULL); 1959 kva = (vm_offset_t)bp->b_data; 1960 1961 /* 1962 * Map the pages to be read into the kva. 1963 */ 1964 pmap_qenter(kva, ap->a_m, pcount); 1965 1966 /* Build a minimal buffer header. */ 1967 bp->b_cmd = BUF_CMD_READ; 1968 bp->b_bcount = size; 1969 bp->b_resid = 0; 1970 bp->b_runningbufspace = size; 1971 if (size) { 1972 runningbufspace += bp->b_runningbufspace; 1973 ++runningbufcount; 1974 } 1975 1976 bp->b_bio1.bio_offset = offset; 1977 bp->b_bio1.bio_done = devfs_spec_getpages_iodone; 1978 1979 mycpu->gd_cnt.v_vnodein++; 1980 mycpu->gd_cnt.v_vnodepgsin += pcount; 1981 1982 /* Do the input. */ 1983 vn_strategy(ap->a_vp, &bp->b_bio1); 1984 1985 crit_enter(); 1986 1987 /* We definitely need to be at splbio here. */ 1988 while (bp->b_cmd != BUF_CMD_DONE) 1989 tsleep(bp, 0, "spread", 0); 1990 1991 crit_exit(); 1992 1993 if (bp->b_flags & B_ERROR) { 1994 if (bp->b_error) 1995 error = bp->b_error; 1996 else 1997 error = EIO; 1998 } 1999 2000 /* 2001 * If EOF is encountered we must zero-extend the result in order 2002 * to ensure that the page does not contain garabge. When no 2003 * error occurs, an early EOF is indicated if b_bcount got truncated. 2004 * b_resid is relative to b_bcount and should be 0, but some devices 2005 * might indicate an EOF with b_resid instead of truncating b_bcount. 2006 */ 2007 nread = bp->b_bcount - bp->b_resid; 2008 if (nread < ap->a_count) 2009 bzero((caddr_t)kva + nread, ap->a_count - nread); 2010 pmap_qremove(kva, pcount); 2011 2012 gotreqpage = 0; 2013 for (i = 0, toff = 0; i < pcount; i++, toff = nextoff) { 2014 nextoff = toff + PAGE_SIZE; 2015 m = ap->a_m[i]; 2016 2017 m->flags &= ~PG_ZERO; 2018 2019 /* 2020 * NOTE: vm_page_undirty/clear_dirty etc do not clear the 2021 * pmap modified bit. pmap modified bit should have 2022 * already been cleared. 2023 */ 2024 if (nextoff <= nread) { 2025 m->valid = VM_PAGE_BITS_ALL; 2026 vm_page_undirty(m); 2027 } else if (toff < nread) { 2028 /* 2029 * Since this is a VM request, we have to supply the 2030 * unaligned offset to allow vm_page_set_valid() 2031 * to zero sub-DEV_BSIZE'd portions of the page. 2032 */ 2033 vm_page_set_valid(m, 0, nread - toff); 2034 vm_page_clear_dirty_end_nonincl(m, 0, nread - toff); 2035 } else { 2036 m->valid = 0; 2037 vm_page_undirty(m); 2038 } 2039 2040 if (i != ap->a_reqpage) { 2041 /* 2042 * Just in case someone was asking for this page we 2043 * now tell them that it is ok to use. 2044 */ 2045 if (!error || (m->valid == VM_PAGE_BITS_ALL)) { 2046 if (m->valid) { 2047 if (m->flags & PG_WANTED) { 2048 vm_page_activate(m); 2049 } else { 2050 vm_page_deactivate(m); 2051 } 2052 vm_page_wakeup(m); 2053 } else { 2054 vm_page_free(m); 2055 } 2056 } else { 2057 vm_page_free(m); 2058 } 2059 } else if (m->valid) { 2060 gotreqpage = 1; 2061 /* 2062 * Since this is a VM request, we need to make the 2063 * entire page presentable by zeroing invalid sections. 2064 */ 2065 if (m->valid != VM_PAGE_BITS_ALL) 2066 vm_page_zero_invalid(m, FALSE); 2067 } 2068 } 2069 if (!gotreqpage) { 2070 m = ap->a_m[ap->a_reqpage]; 2071 devfs_debug(DEVFS_DEBUG_WARNING, 2072 "spec_getpages:(%s) I/O read failure: (error=%d) bp %p vp %p\n", 2073 devtoname(vp->v_rdev), error, bp, bp->b_vp); 2074 devfs_debug(DEVFS_DEBUG_WARNING, 2075 " size: %d, resid: %d, a_count: %d, valid: 0x%x\n", 2076 size, bp->b_resid, ap->a_count, m->valid); 2077 devfs_debug(DEVFS_DEBUG_WARNING, 2078 " nread: %d, reqpage: %d, pindex: %lu, pcount: %d\n", 2079 nread, ap->a_reqpage, (u_long)m->pindex, pcount); 2080 /* 2081 * Free the buffer header back to the swap buffer pool. 2082 */ 2083 relpbuf(bp, NULL); 2084 return VM_PAGER_ERROR; 2085 } 2086 /* 2087 * Free the buffer header back to the swap buffer pool. 2088 */ 2089 relpbuf(bp, NULL); 2090 if (DEVFS_NODE(ap->a_vp)) 2091 nanotime(&DEVFS_NODE(ap->a_vp)->mtime); 2092 return VM_PAGER_OK; 2093 } 2094 2095 static __inline 2096 int 2097 sequential_heuristic(struct uio *uio, struct file *fp) 2098 { 2099 /* 2100 * Sequential heuristic - detect sequential operation 2101 */ 2102 if ((uio->uio_offset == 0 && fp->f_seqcount > 0) || 2103 uio->uio_offset == fp->f_nextoff) { 2104 /* 2105 * XXX we assume that the filesystem block size is 2106 * the default. Not true, but still gives us a pretty 2107 * good indicator of how sequential the read operations 2108 * are. 2109 */ 2110 int tmpseq = fp->f_seqcount; 2111 2112 tmpseq += (uio->uio_resid + BKVASIZE - 1) / BKVASIZE; 2113 if (tmpseq > IO_SEQMAX) 2114 tmpseq = IO_SEQMAX; 2115 fp->f_seqcount = tmpseq; 2116 return(fp->f_seqcount << IO_SEQSHIFT); 2117 } 2118 2119 /* 2120 * Not sequential, quick draw-down of seqcount 2121 */ 2122 if (fp->f_seqcount > 1) 2123 fp->f_seqcount = 1; 2124 else 2125 fp->f_seqcount = 0; 2126 return(0); 2127 } 2128 2129 extern SYSCTL_NODE(_vfs, OID_AUTO, devfs, CTLFLAG_RW, 0, "devfs"); 2130 2131 SYSCTL_INT(_vfs_devfs, OID_AUTO, mpsafe_writes, CTLFLAG_RD, &mpsafe_writes, 2132 0, "mpsafe writes"); 2133 SYSCTL_INT(_vfs_devfs, OID_AUTO, mplock_writes, CTLFLAG_RD, &mplock_writes, 2134 0, "non-mpsafe writes"); 2135 SYSCTL_INT(_vfs_devfs, OID_AUTO, mpsafe_reads, CTLFLAG_RD, &mpsafe_reads, 2136 0, "mpsafe reads"); 2137 SYSCTL_INT(_vfs_devfs, OID_AUTO, mplock_reads, CTLFLAG_RD, &mplock_reads, 2138 0, "non-mpsafe reads"); 2139